Passive daytime radiative cooling is regarded as a promising technology to achieve all-day subambient cooling without energy consumption and pollution. The installation of monotonous white radiative cooling coating on the facades of buildings poses challenges in terms of aesthetic integration. Fabricating radiative cooling coatings with different colors and high cooling efficiency at a low cost is an optimal solution for their broad adoption and commercialization. Here, inspired by the elytra of the scarab beetle, we design a hierarchically porous nested structured radiative cooling film with high subambient cooling efficiency and flexible color tunability. This film exhibits both high solar reflectance (93.4%) and superior thermal emissivity (92.3%), realizing subambient cooling of ∼10.2°C at night and ∼7.2°C at midday. Its color is brilliant, stable, and flexible. Additionally, this film is self-cleaning and can reduce noise, which suggests possibilities for the development of multifunctional radiative cooling surfaces in building envelopes, automobile coatings, and clothes.

中文翻译：

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模拟圣甲虫的明亮彩色日间辐射冷却涂层


被动日间辐射冷却被认为是一种很有前途的技术，可以实现无能耗和无污染的全天低于环境温度的冷却。在建筑物的立面上安装单调的白色辐射冷却涂层在美学整合方面提出了挑战。以低成本制造不同颜色和高冷却效率的辐射冷却涂层是其广泛采用和商业化的最佳解决方案。在这里，受圣甲虫鞘翅的启发，我们设计了一种分层多孔嵌套结构辐射冷却膜，具有较高的低于环境温度冷却效率和灵活的颜色可调性。该薄膜具有高太阳反射率 （93.4%） 和出色的热发射率 （92.3%），可实现夜间 ∼10.2°C 和正午 ∼7.2°C 的低温冷却。它的颜色鲜艳、稳定、有弹性。此外，这种薄膜具有自清洁功能，可以降低噪音，这表明在建筑围护结构、汽车涂料和服装中开发多功能辐射冷却表面的可能性。